Monday, October 13, 2008

Caterpillars change colors ... who knew?

Recently, my 3-year-old was delighted to find a fuzzy black caterpillar crawling across the sidewalk in our front yard. We took it inside and put it into his brother's bug house, which resembles a tiny pop-up hamper with a zippered lid. Both boys took to feeding it leaves and soon we had an interesting puzzle -- our caterpillar is now turning orange.

I never knew that caterpillars could change colors. Poking around on the Internet, I learned that some caterpillars change color in response to temperature (like the Tomato hornworm)(1). Others are affected by diet and crowding. Some species, like the caterpillars of the American Peppered Moth, can even change color to match their host tree twigs. This ability to hide, known as crypsis, allows them to avoid being eaten by birds (2).

Caterpillars can also change colors when they shed their skin. Christmas Notebook has an amazing set of pictures of caterpillars molting (and then eating their own skin!) in butterfly babies.

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Family-Friendly Science

Everyone starts out a scientist. When a small child asks "Why is the sky blue?" or "How do birds fly?", that is the start of scientific inquiry. Too often, science is taught in a way that is dull or exclusionary. I believe that science belongs to everyone.

Mama Joules

Science lover, Poet, Mom

I am a freelance writer, Maryland Master Naturalist, and poet with a professional and educational background in the environmental sciences.

I was carbon neutral for a day!

In December 2008, Brighter Planet donated one day's worth of carbon offsets in my name.

Cool Things I've Seen: Moreton Bay fig trees, Allerton Garden, Kauai

These trees were featured in the movie Jurassic Park. Their roots are taller than I am!

Fun Photos

Dr. Mom took this one. It makes us laugh!

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